CURRICULUM VITAE Daniel Loss
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Report to Industry Canada
Report to Industry Canada 2013/14 Annual Report and Final Report for 2008-2014 Granting Period Institute for Quantum Computing University of Waterloo June 2014 1 CONTENTS From the Executive Director 3 Executive Summary 5 The Institute for Quantum Computing 8 Strategic Objectives 9 2008-2014 Overview 10 2013/14 Annual Report Highlights 23 Conducting Research in Quantum Information 23 Recruiting New Researchers 32 Collaborating with Other Researchers 35 Building, Facilities & Laboratory Support 43 Become a Magnet for Highly Qualified Personnel in the Field of Quantum Information 48 Establishing IQC as the Authoritative Source of Insight, Analysis and Commentary on Quantum Information 58 Communications and Outreach 62 Administrative and Technical Support 69 Risk Assessment & Mitigation Strategies 70 Appendix 73 2 From the Executive Director The next great technological revolution – the quantum age “There is a second quantum revolution coming – which will be responsible for most of the key physical technological advances for the 21st Century.” Gerard J. Milburn, Director, Centre for Engineered Quantum Systems, University of Queensland - 2002 There is no doubt now that the next great era in humanity’s history will be the quantum age. IQC was created in 2002 to seize the potential of quantum information science for Canada. IQC’s vision was bold, positioning Canada as a leader in research and providing the necessary infrastructure for Canada to emerge as a quantum industry powerhouse. Today, IQC stands among the top quantum information research institutes in the world. Leaders in all fields of quantum information science come to IQC to participate in our research, share their knowledge and encourage the next generation of scientists to continue on this incredible journey. -
Hybrid Qubits Solve Key Hurdle to Quantum Computing 28 December 2018
Hybrid qubits solve key hurdle to quantum computing 28 December 2018 In 1998, Daniel Loss, one of the authors of the current study, came up with a proposal, along with David DiVincenzo of IBM, to build a quantum computer by using the spins of electrons embedded in a quantum dot—a small particle that behaves like an atom, but that can be manipulated, so that they are sometimes called "artificial atoms." In the time since then, Loss and his team have endeavored to build practical devices. There are a number of barriers to developing practical devices in terms of speed. First, the device must be able to be initialized quickly. Initialization is the process of putting a qubit into a certain state, and if that cannot be done rapidly it slows down the device. Second, it must maintain coherence for a time long enough to make a measurement. Coherence refers to the Schematic of the device. Credit: RIKEN entanglement between two quantum states, and ultimately this is used to make the measurement, so if qubits become decoherent due to environmental noise, for example, the device Spin-based quantum computers have the potential becomes worthless. And finally, the ultimate state to tackle difficult mathematical problems that of the qubit must be able to be quickly read out. cannot be solved using ordinary computers, but many problems remain in making these machines While a number of methods have been proposed scalable. Now, an international group of for building a quantum computer, the one proposed researchers led by the RIKEN Center for Emergent by Loss and DiVincenzo remains one of the most Matter Science have crafted a new architecture for practically feasible, as it is based on quantum computing. -
Quantum Computation with Spins in Quantum Dots
Quantum Computation With Spins In Quantum Dots Fikeraddis Damtie June 10, 2013 1 Introduction Physical implementation of quantum computating has been an active area of research since the last couple of decades. In classical computing, the transmission and manipulation of classical information is carried out by physical machines (computer hardwares, etc.). In theses machines the manipulation and transmission of information can be described using the laws of classical physics. Since Newtonian mechanics is a special limit of quantum mechanics, computers making use of the laws of quantum mechanics have greater computational power than classical computers. This need to create a powerful computing machine is the driving motor for research in the field of quantum computing. Until today, there are a few different schemes for implementing a quantum computer based on the David Divincenzo chriterias. Among these are: Spectral hole burning, Trapped ion, e-Helium, Gated qubits, Nuclear Magnetic Resonance, Optics, Quantum dots, Neutral atom, superconductors and doped silicon. In this project only the quantum dot scheme will be discussed. In the year 1997 Daniel Loss and David P.DiVincenzo proposed a spin-qubit quantum computer also called The Loss-DiVincenzo quantum computer. This proposal is now considered to be one of the most promising candidates for quantum computation in the solid state. The main idea of the proposal was to use the intrinsic spin-1=2 degrees of freedom of individual elecrons confined in semiconductor quantum dots. The proposal was made in a way to satisfy the five requirements for quantum computing by David diVincenzo which will be described in sec. -
X 5 Quantum Computing with Semiconductor Quantum Dots
X 5 Quantum Computing with Semiconductor Quantum Dots Carola Meyer Institut fur¨ Festkorperforschung¨ (IFF-9) Forschungszentrum Julich¨ GmbH Contents 1 Introduction 2 2 The ”Loss-DiVincenzo” proposal 2 3 Read-out of a single electron spin 3 3.1 Single shot read-out . 4 3.2 Singlet-Triplet read-out . 7 4 Manipulation of electron spins 8 4.1 Singlep spin rotation . 9 4.2 The SW AP operation . 10 5 Relaxation mechanisms 14 5.1 Spin-energy relaxation . 15 5.2 Dephasing and decoherence . 18 6 Summary and outlook 20 X5.2 Carola Meyer 1 Introduction Quantum dots can be used to confine single electrons as discussed by M. Wegewijs in the lecture ”Spin and Transport in Quantum Dots”. The quantum computing concepts based on quantum dots can be subdivided in two main branches: optical concepts and electrical concepts. In most of the optical concepts, the two level system representing the quantum bit (qubit) consists of exciton states. These are manipulated using polarized light. In electrical concepts, the spin states of electrons are used as qubit and manipulation can be done all-electrically. This contribution will concentrate on spin states of electrons for quantum information focusing on the most important electrical concept known as ”Loss-DiVincenzo proposal” [1]. It has been shown experimentally for this proposal that all of the ”DiVincenzo criteria” (for a general intro- duction into Quantum Computing see lecture ”Fundamental Concepts of Quantum Information Processing” by T. Schapers)¨ can be met as we shall see in the following. 2 The ”Loss-DiVincenzo” proposal A few years after the first implementation of the CNOT quantum gate using hyperfine and vibrational states of a 9Be+ ion in an ion trap as qubits [2], a row of proposals for a solid state quantum computer appeared, based on cooper pairs [3], nuclear spins in silicon [4], and last but not least electron spins in GaAs quantum dots [1]. -
Quantum Theory of Condensed Matter
Quantum Theory of Condensed Matter 7721tp.lakshmi.04.10.ls.indd 2 5/3/10 9:00:07 AM This page intentionally left blank Proceedings of the 24th Solvay Conference on Physics Quantum Theory of Condensed Matter EDITORS BERTRAND HALPERIN Harvard University, USA ALEXANDER SEVRIN Vrije Universiteit Brussel and International Solvay Institutes, Belgium World Scientific N E W J E R S E Y • LONDON • SINGAPORE • BEIJING • SHANGHAI • H O N G K O N G • TA I P E I • CHENNAI 7721tp.lakshmi.04.10.ls.indd 1 5/3/10 9:00:07 AM Published by World Scientific Publishing Co. Pte. Ltd. 5 Toh Tuck Link, Singapore 596224 USA office: 27 Warren Street, Suite 401-402, Hackensack, NJ 07601 UK office: 57 Shelton Street, Covent Garden, London WC2H 9HE British Library Cataloguing-in-Publication Data A catalogue record for this book is available from the British Library. QUANTUM THEORY OF CONDENSED MATTER Proceedings of the 24th Solvay Conference on Physics Copyright © 2010 by World Scientific Publishing Co. Pte. Ltd. All rights reserved. This book, or parts thereof, may not be reproduced in any form or by any means, electronic or mechanical, including photocopying, recording or any information storage and retrieval system now known or to be invented, without written permission from the Publisher. For photocopying of material in this volume, please pay a copying fee through the Copyright Clearance Center, Inc., 222 Rosewood Drive, Danvers, MA 01923, USA. In this case permission to photocopy is not required from the publisher. ISBN-13 978-981-4304-46-7 ISBN-10 981-4304-46-8 Printed in Singapore. -
Quantum Computing with Semiconductor Spins Lieven M
Quantum computing with semiconductor spins Lieven M. K. Vandersypen, and Mark A. Eriksson Citation: Physics Today 72, 8, 38 (2019); doi: 10.1063/PT.3.4270 View online: https://doi.org/10.1063/PT.3.4270 View Table of Contents: https://physicstoday.scitation.org/toc/pto/72/8 Published by the American Institute of Physics ARTICLES YOU MAY BE INTERESTED IN Teleportation for device-scale quantum computing Physics Today 72, 21 (2019); https://doi.org/10.1063/PT.3.4266 Physics in the former Yugoslavia: From socialist dreams to capitalist realities Physics Today 72, 30 (2019); https://doi.org/10.1063/PT.3.4269 The mathematics and physics of electronic structure theory Physics Today 72, 56 (2019); https://doi.org/10.1063/PT.3.4274 The North American eclipse of 1869 Physics Today 72, 46 (2019); https://doi.org/10.1063/PT.3.4271 A systems perspective of quantum computing Physics Today 72, 40 (2019); https://doi.org/10.1063/PT.3.4163 Fifth-generation broadband wireless threatens weather forecasting Physics Today 72, 24 (2019); https://doi.org/10.1063/PT.3.4267 QUANTUM COMPUTING with semiconductor spins Lieven M. K. Vandersypen and Mark A. Eriksson Arrays of electrically and magnetically controllable electron-spin qubits can be lithographically fabricated on silicon wafers. INTEL CORP 38 PHYSICS TODAY | AUGUST 2019 Lieven Vandersypen is an Antoni van Leeuwenhoek Professor in the Kavli Institute of Nanoscience Delft and QuTech, a research center of Delft University of Technology in the Netherlands. Mark Eriksson is a Vilas Distinguished Achievement Professor in the department of physics at the University of Wisconsin–Madison. -
Symmetry and Control in Spin-Based Quantum Computing Dimitrije Stepanenko
Florida State University Libraries Electronic Theses, Treatises and Dissertations The Graduate School 2005 Symmetry and Control in Spin-Based Quantum Computing Dimitrije Stepanenko Follow this and additional works at the FSU Digital Library. For more information, please contact [email protected] THE FLORIDA STATE UNIVERSITY COLLEGE OF ARTS AND SCIENCES SYMMETRY AND CONTROL IN SPIN-BASED QUANTUM COMPUTING By DIMITRIJE STEPANENKO A Dissertation submitted to the Department of Physics in partial fulfillment of the requirements for the degree of Doctor of Philosophy Degree Awarded: Summer Semester, 2005 The members of the Committee approve the dissertation of Dimitrije Stepanenko defended on June 10, 2005. Nicholas E. Bonesteel Professor Directing Thesis Washington Mio Outside Committee Member Vladimir Dobrosavljevi´c Committee Member Stephan von Molnar Committee Member Mark Riley Committee Member The Office of Graduate Studies has verified and approved the above named committee members. ii To Andrija iii ACKNOWLEDGEMENTS It was unique privilege to spend my graduate school years working with my adviser and mentor, Professor Nick Bonesteel. The most important lessons he had taught me are that intuitive models and insights based on them are at least as important as the technical skills and that clarity and simplicity are necessary ingredients of every successful research. People who contributed to research presented in this thesis, both directly and through the inspiring discussions are Nicholas Bonesteel and Layla Hormozi from the Florida State University, Kerwin Foster from the Dillard University, David DiVincenzo from the IBM T. J. Watson Research Center and Guido Burkard and Daniel Loss from the University of Basel. I enjoyed the conversations about condensed matter physics with Professors Vladimir Dobrosavljevi´c, Pedro Schlottmann and Stephan von Molnar that kept me aware that there are many interesting faces of every problem. -
Quantum Computation and Communication Using Electron Spins in Quantum Dots and Wires
Quantum Computation and Communication using Electron Spins in Quantum Dots and Wires Inauguraldissertation zur Erlangung der W¨urdeeines Doktors der Philosophie vorgelegt der Philosophisch-Naturwissenschaftlichen Fakult¨at der Universit¨atBasel von Guido Burkard aus Schenkon LU Basel, 2001 Genehmigt von der Philosophisch-Naturwissenschaftlichen Fakult¨at auf Antrag von Prof. Dr. Daniel Loss Dr. David P. DiVincenzo Basel, den 10. April 2001 Prof. Dr. Andreas D. Zuberb¨uhler Dekan Abstract The recent discovery of efficient quantum algorithms for factoring and database search has shown that quantum computing would allow to solve important problems which are intractable with conventional computers. In contrast to the very demanding task of building a large-scale quantum computer, there are quantum communication protocols, e.g. quantum key distribution for cryptography, which|though still difficult—require much less effort and can be implemented with current technology. Apart from the technological motivation, the study of quantum information of- fers (at least) two additional benefits. First, new insight into fundamen- tal questions on quantum mechanics, e.g. concerning non-locality and en- tanglement, are gained from an information-theoretical approach. And second, investigating a particular physical implementation of quantum information can give rise to independent physical results. Spintronics, the use of spin as opposed to charge in (classical) electronics is a new field for which some results presented here could be relevant. In this dissertation we investigate several theoretical aspects of the physical implementation of quantum computation and communication in which the fundamental unit of quantum information, the qubit, is represented by the spin of electrons in semiconductor quantum dots. -
Diapositiva 1
Escuela de Física Matemática Uniandes Coupled Quantum Dots and Other Solid State Physical Models for Quantum Computing Servio Tulio Pérez Merchancano. Departamento de Física Universidad del Cauca Grupo de Semiconductores y Nuevos Materiales - Senuma INDEX 1. Motivation 2. Quantum Computing 3. Quantum Dots 4. Loss and DiVincenzo models 5. Quantum Dot modelling 6. Spin – Orbit Coupling 7. Energy Exchange in Quantum Dots 8. Quantum dots and optical cavities 9. Spectral Functions 10.Double barrier models in solid state and quantum computing. ABSTRACT • In this work, the exchange of energy J for a system of two laterally-coupled quantum dots, each one with an electron, is calculated analytically and in a detailed form, considering them as hydrogen-like atoms, under the Heitler-London approach. The atomic orbitals, associated to each quantum dot, are obtained from translation relations, as functions of the Fock- Darwin status. Our results agree with the ones reported by Burkard, Loss and DiVincenzo in their model of quantum gates based on quantum dots, as well as with the recent experimental reports. •On the other hand we have studied other models of quantum tunneling effects that include spin effects that are sources of the entanglement and that, based in solid state physics, contribute to the understanding and potential production of quantum mechanisms. 1. MOTIVATIÓN Addressing and learning even more about a new branch of physics called quantum computation and its application of solid state prototypes for physical realization of quantum computers. QUANTUM COMPUTING 2. QUANTUM COMPUTING Definition: New model of computation in which the effects described by quantum mechanics for the subatomic world as superposition and entanglement are used as tools for information processing.